Draw a pie chart to represent how you spend your waking hours in a day. Use the data given in the table. Activity Time spent Studying 5 h Playing with friends 1 h Playing sports 3 h Watching television 2 h Reading 2 h Eating meals 2 h Bathing and getting ready for school 1 h Total 16 h

The angle for representing the hours can be calculated, For studying, time = 5 h Angle = Frequency Total frequency × 360 ° , Angle = 5 16 × 360 ° = 112 . 5 ° . For Playing with friends, time = 1 h Angle = 1 16 × 360 ° = 22 . 5 ° . For playing sports, time = 3 h Angle = 3 16 × 360 ° = 67 . 5 ° . For watching television, time = 2 h Angle = 2 16 × 360 ° = 45 ° . For reading, time = 2 h Angle = 2 16 × 360 ° = 45 ° . For eating meals, time = 2 h Angle = 2 16 × 360 ° = 45 ° . For Bathing and getting ready for school, time = 1 h Angle = 1 16 × 360 ° = 22 . 5 ° . So, the required pie chart will be

HARD

7th CBSE

IMPORTANT

Earn 100

Why does a simple pendulum in motion stop swinging after some time even if you do not stop it yourself?

Important Questions on Motion and Time

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7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP UP>Q 2

How did the sundial help our ancestors determine the time of the day?

EASY

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP UP>Q 2

The winning athlete may reach the finish line sometime in less than a tenth of a second before the athlete in second place. How is this short time interval measured?

HARD

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP UP>Q 3

A bus descends through a height of

2000 m

while travelling downhill from a hill station to the plains. The bus set out at

8 .00 a . m

. and completed its journey at

10 .00 a . m

. Assume that the speed of the bus remains constant during the journey. Draw a line graph showing the vertical descent of the bus over time. Mark its progress every half an hour.
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HARD

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP UP>Q 3

A bus descends through a height of

2000 m

while travelling downhill from a hill station to the plains. The bus set out at

8 .00 a . m

. and completed its journey at

10 .00 a . m

. Assume that the speed of the bus remains constant during the journey.
What is the rate of vertical descent of the bus in

m / s

? Also express it in

km / h

HARD

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP UP>Q 4

A truck and a car set off from a point at the same time and both travel with constant speeds. The truck travels at

40 km / h

and the car travels at

60 km / h

.
Using lines of different colours, draw distance-time graphs to represent the motion of both the truck and the car over the first three hours.
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HARD

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP UP>Q 4

A truck and a car set off from a point at the same time and both travel with constant speeds. The truck travels at

40 k m / h

and the car travels at

60 k m / h

.
Draw a dotted line on the graph to mark the locations of the truck and car at a point

2.5 h

into the journey. How far is each vehicle from the starting point?
Question Image

HARD

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP UP>Q 5

Draw a pie chart to represent how you spend your waking hours in a day. Use the data given in the table.

Activity	Time spent
Studying	5 h
Playing with friends	1 h
Playing sports	3 h
Watching television	2 h
Reading	2 h
Eating meals	2 h
Bathing and getting ready for school	1 h
Total	16 h

HARD

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 13 - Motion and Time>STEP OUT>Q 1

Arrange the following time measuring devices in the order of the most ancient to the most recently developed.

wrist watch, atomic clock, pendulum clock, water clock, digital clock, stopwatch

Why does a simple pendulum in motion stop swinging after some time even if you do not stop it yourself?

Important Questions on Motion and Time

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